Overcurrent protection circuit and method thereof

a protection circuit and overcurrent technology, applied in the direction of emergency protection for supplying operative power, electronic switching, pulse technique, etc., can solve problems such as damage to electronic devices

Active Publication Date: 2020-02-20
WISTRON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003]In order to make progress of the field of electronic device manufacturing, the requirements for the power transmission ability and the data transmission velocity of the transmission interface are being increased. In a universal serial bus (USB) with a power delivery (PD) function, the data transmission combined with the high-power power source makes the volume of the connector become smaller, and makes the use of the connector become more convenient. However, because the new transmission interface (i.e. the USB with a power delivery function) provides a charging function, the rush current may cause damage to the electronic device. Therefore, in order to prevent damage caused by the rush current and meet requirements for system compatibility, a protection mechanism needs to be established to ensure the safety of the electronic device.

Problems solved by technology

However, because the new transmission interface (i.e. the USB with a power delivery function) provides a charging function, the rush current may cause damage to the electronic device.

Method used

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  • Overcurrent protection circuit and method thereof
  • Overcurrent protection circuit and method thereof
  • Overcurrent protection circuit and method thereof

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Embodiment Construction

[0016]The following description is some embodiments of the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is determined by reference to the appended claims.

[0017]FIG. 1 is a block diagram of an overcurrent protection circuit according to an embodiment of the invention. In the embodiment, the overcurrent protection circuit 100 can be applied to a universal serial bus (USB) with a power delivery (PD) function (e.g. USB Type-C connector integrated with a power delivery function). As shown in FIG. 1, the overcurrent protection circuit 100 may include a power receiving end VBUS, a power supply end VIN, a voltage conversion chip 110, a switch 120 and a first current detection circuit 130. Compared with a traditional USB, the USB with a power delivery function may provide better power transmission ability and higher data transmission velocity, wherein the vol...

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Abstract

An overcurrent protection method is provided. The overcurrent protection method is applied to a USB with a PD function. The overcurrent protection method includes the steps of converting an input voltage into a first voltage to provide power to the first electronic device; determining whether the working current of the first electronic device is greater than a first default value; determining whether the working current of the first electronic device is greater than a second default value; in response to the working current being greater than the first default value, a first sensing signal is generated to disable a switch and to form an open circuit between the first electronic device and the second electronic device; and in response to the working current being greater than the second default value, conversion of the input voltage into the first voltage is stopped.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This Application claims priority of CN Patent Application No. 201810947568.2 filed on Aug. 20, 2018, the entirety of which is incorporated by reference herein.BACKGROUND OF THE INVENTIONField of the Invention[0002]The invention generally relates to an overcurrent protection circuit and method. Description of the Related Art[0003]In order to make progress of the field of electronic device manufacturing, the requirements for the power transmission ability and the data transmission velocity of the transmission interface are being increased. In a universal serial bus (USB) with a power delivery (PD) function, the data transmission combined with the high-power power source makes the volume of the connector become smaller, and makes the use of the connector become more convenient. However, because the new transmission interface (i.e. the USB with a power delivery function) provides a charging function, the rush current may cause damage to the e...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02H3/087H02H3/093H01L27/02H03K17/082
CPCH03K17/0822H02H3/087H01L27/0266H02H3/093H02H3/08H02H1/0007H02H1/06H03K2217/0054H03K17/102
Inventor LI, YONG BOLI, YONG QIANGYANG, WEN LONGQIU, JUN XIN
Owner WISTRON CORP
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